gcc/ada/s-vmexta.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --            S Y S T E M . V M S _ E X C E P T I O N _ T A B L E           --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1997-2013, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  This package is usually used only on OpenVMS systems in the case
  33 --  where there is at least one Import/Export exception present.
  34
  35 with System.Standard_Library;
  36
  37 package System.VMS_Exception_Table is
  38
  39    package SSL renames System.Standard_Library;
  40
  41    subtype Exception_Code is System.Address;
  42
  43    procedure Register_VMS_Exception
  44      (Code : Exception_Code;
  45       E    : SSL.Exception_Data_Ptr);
  46    --  Register an exception in hash table mapping with a VMS condition code.
  47    --
  48    --  The table is used by exception code (the personnality routine) to detect
  49    --  wether a VMS exception (aka condition) is known by the Ada code. In
  50    --  that case, the identity of the imported or exported exception is used
  51    --  to create the occurrence.
  52
  53    --  LOTS more comments needed here regarding the entire scheme ???
  54
  55 private
  56
  57    --  The following functions are directly called (without import/export) in
  58    --  init.c by __gnat_handle_vms_condition.
  59
  60    function Base_Code_In (Code : Exception_Code) return Exception_Code;
  61    --  Value of Code with the severity bits masked off
  62
  63    function Coded_Exception (X : Exception_Code)
  64      return SSL.Exception_Data_Ptr;
  65    --  Given a VMS condition, find and return its allocated Ada exception
  66
  67 end System.VMS_Exception_Table;